/*
 * Copyright 2017, OpenSkywalking Organization All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Project repository: https://github.com/OpenSkywalking/skywalking
 */

package org.skywalking.apm.collector.core.data;

import org.skywalking.apm.collector.core.define.DefineException;
import org.skywalking.apm.collector.core.define.DefinitionLoader;
import org.skywalking.apm.collector.core.define.Loader;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.LinkedList;
import java.util.List;

/**
 * 存储定义加载器
 *
 * @author peng-yongsheng
 */
public class StorageDefineLoader implements Loader<List<TableDefine>> {

    private final Logger logger = LoggerFactory.getLogger(StorageDefineLoader.class);

    @Override public List<TableDefine> load() throws DefineException {
        List<TableDefine> tableDefines = new LinkedList<>();

        // 创建 StorageDefinitionFile 对象
        StorageDefinitionFile definitionFile = new StorageDefinitionFile();
        logger.info("storage definition file name: {}", definitionFile.fileName());

        // 加载 TableDefine
        DefinitionLoader<TableDefine> definitionLoader = DefinitionLoader.load(TableDefine.class, definitionFile);

        // 返回 TableDefine 数组
        for (TableDefine tableDefine : definitionLoader) {
            logger.info("loaded storage definition class: {}", tableDefine.getClass().getName());
            tableDefines.add(tableDefine);
        }
        return tableDefines;
    }

}
